[dolphin] [Bug 499551] Dolphin hangs when opening context menu for directory with many files or for a huge file selection

[Méven]

https://bugs.kde.org/show_bug.cgi?id=499551

--- Comment #11 from Méven <meven at kde.org> ---
(In reply to Andrea Ippolito from comment #10)
> Created attachment 178012 [details]
> flamegraph context menu on large file selection
> 
> This is to show the context menu on a selection of 5000 flat files (4KB
> .bin), no sub-dirs
> 
> Seems to be related to mime types again (triggered by the compress/extract
> actions)?

Yes that's a different issue in ark in CompressFileItemAction and
ExtractFileItemAction that scan all the files.
They will probably need some similar work to limit the determineMimeType calls:
https://invent.kde.org/utilities/ark/-/blob/master/app/compressfileitemaction.cpp?ref_type=heads
https://invent.kde.org/utilities/ark/-/blob/master/app/extractfileitemaction.cpp?ref_type=heads

It exposes two issues with the API, the plugins can impact the application
(there run in main thread) and those mimetypes have already be determined by
dolphin when it loaded the folder, so they could share this information.

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